Your New to Who FAQ: A Guide For People Ready to Meet the Doctor
Because the budget was very small and because science fiction monsters are inherently crappy looking 90 percent of the time.
Why is he called "The Doctor?"
He is one, apparently. The Doctor has claimed to hold advanced degrees in everything from medicine to cheese making. Aside from that, it's not really known why he goes by the alias. One theory is that renegade Time Lords like himself adopt aliases upon going rogue, as his enemy The Master and his friend The Corsair did.
As to what his true name is, no one knows. Obviously he has one. Other Time Lords such as Romana and Rassilon have conventional names. Supposedly "Doctor Who?" is the most powerful secret in the universe.
What is a sonic screwdriver?
The Doctor's weapon of choice. It can't kill anyone, but it opens doors, repairs barbed wire, hacks into computer systems, and even occasionally unscrews things.
What is a Dalek?
Picture R2-D2 being controlled by a tiny alien Nazi having a temper tantrum.
What's so special about this show anyway?
Well, I can only speak for me, obviously, but here goes.
Have you ever wanted to simply step out of your door one morning and be whisked away to some grand adventure? That's every single episode of Doctor Who. It's all about he takes ordinary, every-day people and shows them a universe of infinite wonder and excitement. His companions aren't special, they don't have superpowers like Superman or magic like Harry Potter or even money like Batman. They're just folks who all of a sudden get to experience the whole of space and time.
Traveling with The Doctor is literally like taking a road trip with God... except that this god needs you just as much as you need him. He's brilliant, and clever, and brave, and most of all he just wants everyone to get a long before things go to hell. Watching his human friends stand with him as he saves the universe time and time again is the very best kind of adventure because it is so easy to picture ourselves in their place.
In short, Doctor Who is a show for people that look at all of history and existence and want to knows as much about it as possible. It's being thrown into mystery and danger constantly, but also being able to handle it. It's the greatest show ever made, and I hope you'll catch it sometime.